SCSIO OpenIR  > 热带海洋环境国家重点实验室(LTO)
Characteristics of internal tides in deep water northwest of the Xisha Islands
Yan Tong; Jing Zhi-You; Qi Yi-Quan; Wang Dong-Xiao; Qi, YQ (reprint author), Chinese Acad Sci, State Key Lab Trop Oceanog, South China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China.
2016
Source PublicationCHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
Volume59Issue:7Pages:2587-2597
AbstractInternal tides are internal gravity waves with quasi-tidal periodicities, which are ubiquitous in the ocean. Their characteristics in deep water areas between the Hainan Island and Xisha Islands in the northwestern South China Sea (SCS) are investigated based on 5-year moored current observations. The methods used in this study include power spectral analysis, harmonic analysis and dynamical mode decomposition are performed. The results show that the barotropic and baroclinic tidal currents in the study region are both dominated by diurnal oscillations. The vertical isopycnal diurnal displacement can reach 40 m at a depth of 500 similar to 900 m. Diurnal internal tidal currents mainly propagate across the continental slope, approximately 41% of which is phase locked with astronomical tides. The ratio is nearly double of that in the northeast SCS. In the upper ocean, it is found that the variability of internal 01 amplitude is significantly positively correlated with the local sea level height, which suggests a strong modulation by the upper oceanic density field. On the other hand, the Kt internal tid e shows a semi-annual variation with intensification in summer and winter due to the superposition of barotropic forcing from K-1 and P-1 constituents. Furthermore, dynamical mode decomposition shows that the two baroclinic modes together account for more than 70% of O-1 constituent energy, while the contribution of the third mode in the K-1 cannot be neglected, which has 25% of total K-1 energy in someone deployment.
Department[Yan Tong; Jing Zhi-You; Qi Yi-Quan; Wang Dong-Xiao] Chinese Acad Sci, State Key Lab Trop Oceanog, South China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Yan Tong] Univ Chinese Acad Sci, Beijing 100049, Peoples R China ; LTO
KeywordNorthwestern South China Sea Xisha Mooring Dynamical Mode Decomposition Internal Tide
Subject AreaGeochemistry & Geophysics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/15353
Collection热带海洋环境国家重点实验室(LTO)
Corresponding AuthorQi, YQ (reprint author), Chinese Acad Sci, State Key Lab Trop Oceanog, South China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China.
Recommended Citation
GB/T 7714
Yan Tong,Jing Zhi-You,Qi Yi-Quan,et al. Characteristics of internal tides in deep water northwest of the Xisha Islands[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2016,59(7):2587-2597.
APA Yan Tong,Jing Zhi-You,Qi Yi-Quan,Wang Dong-Xiao,&Qi, YQ .(2016).Characteristics of internal tides in deep water northwest of the Xisha Islands.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,59(7),2587-2597.
MLA Yan Tong,et al."Characteristics of internal tides in deep water northwest of the Xisha Islands".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 59.7(2016):2587-2597.
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